Coherer-protector.



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Specification of Letters Patent.

- 1r.. D. BETZ, 0F KANSAS CITY, MISSOURI.

Application filed January 28, 1914. Serial No. 814,933.

To all wtom t may'comem:

Be it known that I, HARRY D. Bn'rz, a' citif y same, reference being had to the accompanying drawings, and to the letters' and gures'of reference marked thereon, which form apart of this specification.

My invention relates to coherers, and moreA particularly to'coherers for use as a part of a Wireless apparatus, or the like; the prin# cipal object of the present invention being to provide means for protecting the coherer, or the like from stray or undesired Hertzian waves, or the like, and particularlyfrom the waves originating in a local transmitter, or any' nearly electrical disturbance.

More particularly the invention comprises a metallic case for inclosing the coherer to exclude undesired waves therefrom, `contact members normally located within the case and adapted for contacting the coherer terminals, and means for withdrawing the contact members from the metallic case a sufficient distance to insure against the coherer being aected by Hertzien waves or the like, during a protective period.

In accomplishing this object I provide means for mechanically spacing or withdrawing the contact members of the coherer, together with 'means for automatically reuniting the lcontacts-when the period for protection to the coherer has expired, so that when the Contact members are in contact withV the coherer terminal, I-Iertzian waves may aect the coherer, and in carrying out the invention I have provided 'forms 0f structure which are illustrated in the ac'- companying drawings, wherein Figure I is a plan view of a coherer and its protective means, together with .means for breaking and making the contacts to the coherer.

Fig. II is a horizontal sectional view of the same.

Fig. III is a side elevation of the same; a part of one ofthe side necks being broken away for better illustration.

Referring to the drawin s:-

designates a coherer o the filings type,

andA which'contains the usual filings 2, plugs 3 and terminal wires 4 which extend through and are sealed in opposlte ends of the tube and are connected with the contact springs 5.

In one form of my invention, the ends of the coherer are supported by tubes 6 of ber, or other insulation material, which, in

turn, are-mounted in the heads 7.-8 of a metallic case 9, which may be supported on-l a suitable foundation 10; the head 8 being@ preferably permanently, metallically sealed., in the case, and the head 7 removably secured therein by screws 11, orthe like.

The fiber tubes 6 project beyond the ends' of the heads and into ber or like nonyconductive sleeves 12; the outer ends of which inclose the .projecting ends of the cores 13 of electro-magnets 14.

Slidably mounted in each of the ber tubes '6 is a contact member 1 6; the inner and adapted for engagement with the spring 5, having conductive relation with the 'terminal wires 4f, and the outer portion of Patented Oct. 9, 191'?.

- face 17 of which is of good Contact material wires 22 which extend out through slots 23 in the fiber sleeves and to a source of radiant supply, or the like, (not shown), such as the antenna and ground, or the equivalence, of a wireless apparatus.

As the contact members at each end of the coherer are provided with metallicl connections to wires 22; the wires 22 having Connection with a supply source, it is apparent that current may be carried through the Wires andcontact members to the interior of the coherer when the contact members contact the coherer, so that the lings therein are cohered and close a circuit through the coherer when Hertzian waves, or the like,

are resent, and that, owing to the presence` psi coherer by waves sentout from a nearby transmitter when the coherer and its protecti ve means is used in a wireless apparatus, l provide the magiets, or the like, for posin tively` withdrawing the contact members from operative position with the coherer teru minals when the local transmitter, or the like, is in operation; the means for energizing the magnets, or the like, beine* or" .any suitable means (not shown), and, i1 desired, automatically operable by some mechanism, so that current is sent to the magnets, or the like, in order to withdraw the contact members before the transmitter becomes active; such mechanism, however, being merely indicated by the circuit Wires 25, which are shown connected in multiple with the paired magnets, so that a circuit may be closed therethrough to magnetize the cores 13, so that the armatures 19 are drawn outwardly in the fiber vsleeves and the contact members 16 and their faces 17 pulled away from the spring contact terminals on the coherer a sufficient distance to prevent the closing oit a circuit through the coherer by outside waves; the travel of the armatures and slid- I a ble contact members being suiiicient to draw the said members entirely out of tnemetallic case, so that the energetic waves produced 'by the transmitter, or from other local source, when contacting the metal case, will 'be excluded from the coherer, which is incloscd within the case.

The magnets which lt have illustrated and prefer to use comprise metallic saddles 26, which. inclose the magnets longitudinally,

and have points 27 terminating the inner ends of the cores, in order te aid the magnetic field from the opposite pole, so that the magnetic field may be easily carried from the outer to the inner poles of the magnets, in order to increase the efilciency of the magnets.

While ll have specifically described a particular mechanism. for actuating the contact members, 1 do not wish to be understood as limiting myself thereto, as equivalent mech* anism may be substituted therefor.

Having thus described my invention, what l claim as new therein, anddesire to secure by liettersDatent, is:

1. The combination with a coherer having end terminals, of a metallic caseinclosing the coherer, contact members adapted for cooperation with the coherer terminals, and means for simultaneously withdrawing the contact members from said case.

2. The combination with coherer having end terminals, of a case inclosing the coherer, non-conductive conduits extending through the case, movable contact members located in said conduits and adapted for cooperation with the coherer terminals, and means for actuating the contact members.

.3. '.llie combination with coherer having end terminals, of a case inclosing the coherer, conduits located in the` case, contact members slidable in the conduits and adapt ed for cooperation with the coherer terminals, means for yieldingly tensioning the contact members toward the coherer terminals, and means for withdrawing the con'- tact members from -the coherer terminals against the yielding means.

li. rihe combination with a cohercr having terminals, of a case inclosing thecoherer, non-conductive conduits projecting through the case, contact members in said conduits, yielding means for forcing the contact members toward the coherer terminals, and means' for withdrawing the contacts from engagement with the said terminals against said yielding means.

5. rlhe combination with a metallic case having closed ends, oit non-conductive conduits extending through'the closed ends into the interior of the case, a coherer supported by said conduits, out of Contact with the case, and having terminals projecting into the conduits, contact members slidahly mounted in the conduits, and means for actuating the contact members.

.6. The combination with a metallic case having closed ends, ol non-conductive conduits extending through the closed ends i-nto the interior of the case, a coherer supported by said conduits, out oit contact with the case and having terminals projecting into the conduits, contact members slidably mounted in the conduits, means for yieldingly tensioning the contact members lto Contact the coherer terminals, and means for actuating the contact members against the tension oli the yielding means.

'7. rlhe combination ot a metallic case and magnets spaced from the ends of the case, conduits located in and projecting from the ends of the case, a coherer. supported by said conduits, within the case, sleeves leading from the conduits to said magnets, Contact members slidably mounted in the conduits, armatures slidably mounted in the sleeves and connected with the contact members, and means for yieldingly engaging the armatures to tension the contact members toward the coherer terminals. v

8. Vllhe combination of ametallic case and magnets spaced from the ends ofthe case, conduits located in and projecting from the ends of the case, a coherer supported b said conduits, within the case, slotted s eeves leading from'the conduits to said magnets, contact members slidably mounted in the conduits, armatures slidably mounted in the sleeves and connected with the Contact;

members, springs lin thesleeves. yieldingly engaging the armatures to tension fthe contact members toward theeoherer terminals, and wires connected with said Contact memhere extending through the sleeve slots.

9. The combination with a coherer having end terminals, of a metallic case inclosing the coherer, radiant supply terminals yieldingly tensioned toward said coherer terminals, and means for withdrawing said radiant supply terminals from said coherer ter-r yieldingly tensioninglsaid terminals toward the coherer terminals, and means for withdrawing said radiant supply terminals from the coherer terminals against the yielding tension.

11. The combination with a conductive:

, nals slidably mounted in said bushings, and

means for making and breaking contact between said coherer' and radiant supply terminals.

12. The combination with a metallic case having non-conductive, axial bushings, of a coherer supported in said bushings within the case, and having terminals exposed through said bushings, an antenna to ground circuit, having its terminals slidably mounted in said bushings, springs for yieldingly tensioning said terminals toward said coherer terminals, and magnets for drawing said antenna to ground circuit terminals against the tension of said springs to break connection with the coherer terminals.

13. In a device for receiving Hertzian waves, a metallic case,non-conductive axial bushings in saidfcase, a coherer tube supported by said axial bushings, coherer arms invsaid coherer. tube projecting intosaid bushings, metallic particles in said coherer tube between said coherer arms, an antenna to ground circuit, terminals for said circuit slidably mounted in said bushings, a magnet located adjacent each end of the metallic case, an armature for each of said antenna to ground circuit terminals, springs adapted to bear against said magnets and armatures for normally holding said terminals against said magnets to break connection between said terminals and coherer arms.

14;. Apparatus for the purpose described comprising a detector, a metal tube surrounding and projecting beyond the ends of the saine and metal plugs arranged to slide in the projecting ends of said tube and t0 closeand open circuit through said detector within said tube.

15..The combination with a coherer'or other detector having end or other terminals1 of a" case, composed of any suitable conducting material or materials, entirely inclos'ing the coherer except for two or more small round holes therein, contact members said coherer arms, and means for energizing movable in said holes and normally engaging the coherer or its terminals within such case, and means for actuating the contact members. n

16. The combination with a coherer having end or other terminalsof a case composed of any suitable conducting material or materials entirely inclosing the coherer except for two or more small holes therein, and contact members movable in said holes and normally in close proximity to the c0- herer, and means for actuating the contact members. l

17. A receiving device having usual detector and circuit connections lea-ding thereto, and a metallic protecting-casing inclos-v ing said detector, the said connections being separable from the detector within the casing, 'whereby the energy of undesired transmitting waves will not aEect the detector.

18. A receiving device having usual detector and circuit connections leading thereto, a metallic protecting casing inclosingr said detector, and means whereby said connections can be vreadily separated from said detector, said separations taking place within the casing whereby the energy of undesired transmittingv waves will not aiectthe detector.

in testimonywnereof I ax my signature in presence of two witnesses. 

